.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  flex-direction: column;
  overflow-x: hidden;
  text-align: center;
}


.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.5s ease;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}

@keyframes scaleDraw {

  /*定义关键帧、scaleDrew是需要绑定到选择器的关键帧名称*/
  0% {
    transform: scale(1);
    /*开始为原始大小*/
  }

  25% {
    transform: scale(1.1);
    /*放大1.1倍*/
  }

  50% {
    transform: scale(1);
  }

  75% {
    transform: scale(1.1);
  }
}

.ballon {
  -webkit-animation-name: scaleDraw;
  /*关键帧名称*/
  -webkit-animation-timing-function: ease-in-out;
  /*动画的速度曲线*/
  -webkit-animation-iteration-count: infinite;
  /*动画播放的次数*/
  -webkit-animation-duration: 4s;
  /*动画所花费的时间*/
}